US20080148980A1 - Method for controlling a rotary press and rotary press - Google Patents
Method for controlling a rotary press and rotary press Download PDFInfo
- Publication number
- US20080148980A1 US20080148980A1 US12/005,004 US500407A US2008148980A1 US 20080148980 A1 US20080148980 A1 US 20080148980A1 US 500407 A US500407 A US 500407A US 2008148980 A1 US2008148980 A1 US 2008148980A1
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- United States
- Prior art keywords
- printing
- web
- feed
- cylinder
- cylinders
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F13/00—Common details of rotary presses or machines
- B41F13/004—Electric or hydraulic features of drives
- B41F13/0045—Electric driving devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F33/00—Indicating, counting, warning, control or safety devices
- B41F33/18—Web break detection
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
- B41P2213/00—Arrangements for actuating or driving printing presses; Auxiliary devices or processes
- B41P2213/70—Driving devices associated with particular installations or situations
- B41P2213/73—Driving devices for multicolour presses
- B41P2213/734—Driving devices for multicolour presses each printing unit being driven by its own electric motor, i.e. electric shaft
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
- B41P2233/00—Arrangements for the operation of printing presses
- B41P2233/20—Safety devices preventing damage
- B41P2233/23—Safety devices preventing damage by preventing the web winding up around cylinders
Definitions
- the present invention relates to a process for controlling a rotary press for printing a web of material, the press being of the type comprising printing units each having at least one cylinder for printing and feeding the web, the press comprising at least one cylinder for feeding said web located downstream of the printing units in the direction of movement of the web.
- a web to be printed moves under tension and at high speed on the printing and feed cylinders and on the or each downstream feed cylinder.
- the printing and feed cylinders and the downstream feed cylinders are in contact with the web and are driven in rotation in such a manner that they contribute to the feeding of the web.
- the printing and feed cylinders also print the web by depositing ink thereon.
- An object of the invention provides limiting the risks of damage to the printing units in the event of the web breaking.
- the invention provides a process for controlling a rotary press, wherein, in normal operation, said printing and feed cylinders and the or each downstream feed cylinder are driven in a synchronized manner, and, in the event of the web breaking, a step for the differential braking of said printing and feed cylinders and of the or each downstream feed cylinder is implemented.
- this process may include one or more of the following features, taken in isolation or in accordance with any technically possible combination:
- a preliminary step of synchronized braking may be implemented, in which said printing and feed cylinders and the or each downstream feed cylinder are braked in a synchronized manner, and then the differential braking step is implemented;
- each printing and feed cylinder may be moved away from an associated counter-pressure cylinder provided to pinch the web against the printing and feed cylinder, and the differential braking step may be started when each printing and feed cylinder has been moved away from the associated counter-pressure cylinder by a predetermined minimum spacing;
- At least some of the printing and feed cylinders may be braked more rapidly than the or each downstream feed cylinder;
- the printing and feed cylinders may be braked in a synchronized manner
- the printing and feed cylinders may be braked in a differential manner
- the printing and feed cylinders located upstream of a breakage point of the web may be braked more rapidly than the printing and feed cylinders located downstream of the breakage point;
- the printing and feed cylinders located upstream of the breakage point may be braked in a synchronized manner
- the printing and feed cylinder(s) of each printing unit may be braked more rapidly than the printing and feed cylinder(s) of the adjacent printing unit located downstream, while at the same time maintaining each printing and feed cylinder and an associated counter-pressure cylinder in a configuration of pinching the web between them;
- each printing unit may include two printing groups each comprising a printing and feed cylinder, the printing and feed cylinder of each printing group forming a counter-pressure cylinder for the printing and feed cylinder of the other printing group in order to pinch the web against the printing and feed cylinder of said other printing group;
- each printing and feed cylinder may be a blanket cylinder of a printing group also having a plate cylinder.
- the invention also provides a rotary press of the type comprising a plurality of printing units each having at least one printing group comprising a cylinder for printing and feeding a web to be printed, and a counter-pressure cylinder for pinching a web to be printed between the counter-pressure cylinder and the printing and feed cylinder, the press also comprising at least one cylinder for feeding said web located downstream of the printing units in the direction of movement of the web, wherein the press comprises means for driving the printing and feed cylinders and the downstream feed cylinders, and control means adapted and programmed for the implementation of a control process such as defined above.
- FIG. 1 is a general diagrammatic view of a rotary press
- FIGS. 2 and 3 are diagrammatic views of a printing unit of the press of FIG. 1 , in two distinct configurations;
- FIGS. 4 to 6 are graphs illustrating different processes for controlling the press of FIG. 1 , these processes being in accordance with the invention.
- FIG. 1 illustrates a rotary press 2 which is to print a web 4 of material, for example, a web of paper.
- the web 4 moves through the press 2 , under tension and at high speed, following a path of movement from left to right in FIG. 1 , as illustrated by the arrow S.
- upstream and downstream are to be understood in relation to the direction of movement of the web 4 in the press 2 following its path of movement.
- the press 2 comprises a plurality of functional units, including, in succession from upstream to downstream, an unreeling unit 6 , printing units U 1 , U 2 , U 3 and U 4 , a drying unit 8 , a cooling unit 10 and a folding and/or receiving unit 12 .
- Units 8 , 10 and 12 are optional.
- the unreeling unit 6 enables the web 4 to be unwound from a roll.
- Each printing unit U 1 , U 2 , U 3 , U 4 enables the web 4 to be printed recto-verso.
- the drying unit 8 enables the web 4 to be dried after it has been printed.
- the cooling unit 10 enables the web 4 to be cooled after it has been dried.
- the folding unit 12 enables the web 4 to be folded, for example, to form pamphlets.
- each printing unit U 1 , U 2 , U 3 and U 4 is a twin unit and comprises two printing groups 14 and 16 located one on each side of the web 4 for recto-verso printing thereof.
- Each of the printing groups 14 and 16 comprises a blanket printing cylinder 18 , a plate cylinder 20 and an inking cylinder 22 , which have parallel axes.
- Each printing unit U 1 , U 2 , U 3 , U 4 comprises a mechanism for supporting and displacing the cylinders 18 , 20 , 22 of the printing groups 14 and 16 between a throw-on configuration ( FIG. 2 ) and a throw-off configuration ( FIG. 3 ).
- the groups 14 and 16 are in throw-on configuration.
- the cylinder 22 deposits ink on one or more plate(s) carried by the cylinder 20 and imposed in accordance with the design to be printed, and the or each plate deposits the ink in accordance with the predetermined design on a blanket carried by the cylinder 18 , which deposits the ink on one face of the web 4 .
- the cylinders 18 are spaced apart from each other by a spacing e sufficient to allow the web 4 to pass through, that is to say, a spacing e greater than the thickness of the web 4 .
- the throw-off configuration permits intervention in the printing unit U 1 , U 2 , U 3 , U 4 for maintenance operations, for example, in order to change the plates, the blankets or the cylinders.
- the cylinders 18 of the groups 14 and 16 are spaced apart but the cylinders 18 , 20 and 22 of the same group 14 , 16 are maintained in a state placed against each other.
- the unreeling unit 6 has cylinders 24 for diverting the web 4 , which are free in rotation.
- the drying unit 8 comprises means for heating the web 4 in order to dry the ink deposited on the web 4 .
- the cooling unit 10 comprises cylinders 26 for diverting the web 4 .
- the folding unit 12 comprises, in the example shown a cone 28 for folding the web 4 , for example, in accordance with a longitudinal folding line.
- the folding unit 12 comprises several pairs of cylinders 30 which are located upstream and downstream of the folding cone 28 . The two cylinders 30 of each pair pinch the web 4 between them.
- the units U 1 , U 2 , U 3 , U 4 , 10 and 12 have devices 32 for driving their cylinders 18 , 26 and 30 , each of those units having its own device 32 .
- Each device 32 comprises one or more motors.
- the device 32 of each of the printing units U 1 , U 2 , U 3 and U 4 comprises a motor common to the two printing groups 14 and 16 , one motor for each printing group 14 and 16 , or one motor for each of the cylinders 18 and 20 , and optionally 22 .
- the press 2 has a detecting device 34 associated with each of the units U 1 , U 2 , U 3 , U 4 , 10 , 12 , and a central control system 36 for all of those units.
- Each detecting device 34 is suitable for emitting a measurement signal representing the angular position or the angular velocity of the cylinders 18 , 26 , 30 of the corresponding unit.
- the control system 36 is connected to the detecting devices 34 in order to receive the measurement signals emitted therefrom and is connected to the drive devices 32 in order to send them control signals after processing the measurement signals.
- the cylinders 18 , 26 and 30 are in contact with the web 4 and are each driven in rotation by the device 32 of their unit U 1 , U 2 , U 3 , U 4 , 10 , 12 . Those cylinders 18 , 26 and 30 feed the web 4 through the press 2 .
- the rotation of the cylinders 18 , 26 and 30 must be synchronized, on the one hand, in order to ensure the movement of the web 4 under tension between the various units of the press 2 and, on the other hand, to ensure correct printing of the web 4 , without any shift between the images printed by the various printing units U 1 , U 2 , U 3 , U 4 .
- control system 36 controls the cylinders 18 , 26 and 30 in respect of angular position and/or angular velocity and ensures that they rotate in a synchronized manner.
- the press 2 has detectors 38 for web breakage which are located along the path of the web 4 .
- the press 2 comprises, for example, one detector 38 between each pair of adjacent units.
- the detectors 38 are detectors of a known type and, for example, optical detectors suitable for detecting a break in the web 4 by the modification of a light beam reflected by the web 4 or passing through the web 4 owing to the loss of tension in the web 4 .
- the web 4 tends to adhere to the cylinders 18 of that printing unit owing to the ink covering those cylinders 18 .
- the web 4 tends to become wound around one of them.
- an emergency shutdown of the press 2 is implemented in the course of which the feed cylinders of the press 2 are braked, for example, by applying to them a resistant braking moment by means of the motors of the drive devices 32 .
- FIG. 4 is a graph showing the rate of movement (y-axis) of the feed cylinders of the press 2 , as a function of time (x-axis).
- the rate of movement of a feed cylinder is the rate of movement applied by that feed cylinder to the web 4 , which is substantially equal to the product of the angular velocity of that cylinder and its radius.
- a step of emergency shutdown of the press 2 is implemented by braking the feed cylinders of the press 2 by applying a braking moment by means of the motors of the devices 32 .
- the printing groups 14 , 16 of the printing units U 1 , U 2 , U 3 and U 4 are displaced into throw-off configuration in order to disengage the cylinders 18 from the web 4 .
- the cylinders of the printing units U 1 , U 2 , U 3 and U 4 , and in particular their cylinders 18 are braked more rapidly than the feed cylinders 26 , 30 of the units 10 , 12 located downstream of the printing units U 1 , U 2 , U 3 and U 4 .
- the cylinders 18 of the printing units U 1 , U 2 , U 3 and U 4 are stopped at instant T 2 , before the feed cylinders 26 , 30 of the units 10 , 12 , which are stopped at an instant T 3 .
- the feed cylinders of the printing units U 1 , U 2 , U 3 and U 4 are stopped in three seconds, while the feed cylinders 26 , 30 of the units 10 , 12 are stopped in ten seconds.
- the faster braking of the cylinders 18 enables a winding thickness of the web 4 around those cylinders 18 to be limited, and consequently limits the risks of damage to those cylinders 18 and to the printing units U 1 , U 2 , U 3 and U 4 .
- the drive motors of the cylinders 18 are generally of a larger capacity than the motors of the other feed cylinders of the press 2 owing to the larger resistant moments encountered by the cylinders 18 .
- the faster braking of the cylinders 18 is therefore possible without making any structural modification to the press 2 and merely by modifying the programming of the emergency shutdown of the control system 36 .
- the cylinders 18 of the printing units U 1 , U 2 , U 3 and U 4 are slowed down in a manner synchronized with each other and stop at the same instant T 2 .
- the feed cylinders of the units 10 and 12 are also stopped in a manner synchronized with each other and stop at the same instant T 3 .
- a preliminary step of synchronized braking is implemented in which the cylinders 18 of the printing units U 1 , U 2 , U 3 and U 4 and the cylinders 26 , 30 of the units 10 , 12 are slowed down in a synchronized manner, while at the same time displacing the printing groups 14 and 16 of the printing units U 1 , U 2 , U 3 and U 4 into throw-off configuration.
- the differential braking step is implemented as before, by braking the cylinders 18 more rapidly than the cylinders 26 and 30 .
- the cylinders 18 stop at an instant T 5 before the cylinders 26 , 30 which stop at instant T 3 .
- the preliminary step of synchronized braking prevents fresh breaks in the web 4 caused by the different decelerations of the web 4 which increase the tension in the web 4 .
- the differential braking step is commenced as soon as the spacing between the cylinders 18 of each printing unit U 1 , U 2 , U 3 , U 4 is greater than the thickness of the web 4 , without waiting to reach the throw-off configuration.
- the printing groups 14 and 16 of the printing units U 1 , U 2 , U 3 and U 4 are kept in throw-on configuration and the cylinders 18 of the printing units U 1 , U 2 , U 3 and U 4 are slowed down in a differential manner.
- the cylinders 18 of each of the units U 1 , U 2 and U 3 are braked more rapidly than those of the adjacent printing unit U 2 , U 3 and U 4 , respectively, located downstream.
- the deceleration rate of the printing units U 1 , U 2 , U 3 and U 4 decreases from upstream to downstream.
- the result is that the tension of the web 4 is increased between each pair of adjacent printing units between which the web 4 is still under tension, which is the case if the point of breakage of the web 4 is not located between the two printing units of said pair.
- a sufficient increase in tension enables the web 4 to be broken again between the two adjacent printing units, which limits the length of web 4 capable of becoming wound around the cylinders 18 of those printing units.
- the web 4 will be broken owing to the differential braking at three points of secondary breakage, between the units U 1 and U 2 , the units U 2 and U 3 , and the units U 3 and U 4 .
- the cylinders of the printing units U 1 , U 2 , U 3 and U 4 located upstream of the point of breakage are braked more rapidly than the cylinders of the printing units U 1 , U 2 , U 3 and U 4 located downstream of the point of breakage.
- the cylinders of the printing units U 1 , U 2 , U 3 and U 4 located upstream of the point of breakage are slowed down in a manner synchronized with each other, or in a manner which is differential with respect to each other, in accordance with the first variant.
- the cylinders of the printing units U 1 , U 2 , U 3 and U 4 located downstream of the point of breakage are slowed down at the same rate or more rapidly than the cylinders of the units of the press 2 located downstream of the printing units U 1 , U 2 , U 3 and U 4 .
- the risks of becoming wound around are greater when the breakage of the web occurs in a zone A ( FIG. 1 ) of the press 2 between the printing unit U 1 the furthest upstream and the cooling unit 12 , than when the breakage of the web occurs in a zone B downstream of the zone A.
- a differential braking step according to the invention may be implemented when a breakage of the web 4 is detected in the zone A and the differential braking step is not implemented when a breakage of the web is detected in the zone B.
- a differential braking step according to the invention may be implemented.
- a differential braking step may be implemented in accordance with any one of the embodiments and any one of the variants explained above.
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Abstract
A method is provided for a rotary press of the type including cylinders for printing and feeding a web to be printed, and at least one cylinder for feeding said web located downstream of the printing cylinders in the direction of movement of the web.
According to this method, in normal operation, said printing and feed cylinders and the or each downstream feed cylinder are driven in a synchronized manner and, in the event of the web breaking, a step for the differential braking of said printing and feed cylinders and of the or each downstream feed cylinder is implemented.
Description
- This claims the benefit of French Patent Application No. 06 11320, filed on Dec. 22, 2006 and hereby incorporated by reference herein.
- The present invention relates to a process for controlling a rotary press for printing a web of material, the press being of the type comprising printing units each having at least one cylinder for printing and feeding the web, the press comprising at least one cylinder for feeding said web located downstream of the printing units in the direction of movement of the web.
- During printing operations, a web to be printed moves under tension and at high speed on the printing and feed cylinders and on the or each downstream feed cylinder.
- The printing and feed cylinders and the downstream feed cylinders are in contact with the web and are driven in rotation in such a manner that they contribute to the feeding of the web. The printing and feed cylinders also print the web by depositing ink thereon.
- In the event of the web breaking downstream of a printing unit, the web loses its tension and tends to adhere to the printing cylinders of the printing unit, owing to the ink covering them. There is thus a risk that the web will become wound around one of the printing cylinders, which may very rapidly damage the printing unit owing to an accumulation of layers of web in the printing unit.
- An object of the invention provides limiting the risks of damage to the printing units in the event of the web breaking.
- To that end, the invention provides a process for controlling a rotary press, wherein, in normal operation, said printing and feed cylinders and the or each downstream feed cylinder are driven in a synchronized manner, and, in the event of the web breaking, a step for the differential braking of said printing and feed cylinders and of the or each downstream feed cylinder is implemented.
- According to other embodiments, this process may include one or more of the following features, taken in isolation or in accordance with any technically possible combination:
- in the event of the web breaking, a preliminary step of synchronized braking may be implemented, in which said printing and feed cylinders and the or each downstream feed cylinder are braked in a synchronized manner, and then the differential braking step is implemented;
- in the synchronized braking step, within each printing unit, each printing and feed cylinder may be moved away from an associated counter-pressure cylinder provided to pinch the web against the printing and feed cylinder, and the differential braking step may be started when each printing and feed cylinder has been moved away from the associated counter-pressure cylinder by a predetermined minimum spacing;
- in the differential braking step, at least some of the printing and feed cylinders may be braked more rapidly than the or each downstream feed cylinder;
- in the differential braking step, the printing and feed cylinders may be braked in a synchronized manner;
- in the differential braking step, the printing and feed cylinders may be braked in a differential manner;
- in the differential braking step, the printing and feed cylinders located upstream of a breakage point of the web may be braked more rapidly than the printing and feed cylinders located downstream of the breakage point;
- in the differential braking step, the printing and feed cylinders located upstream of the breakage point may be braked in a synchronized manner;
- in the differential braking step, the printing and feed cylinder(s) of each printing unit may be braked more rapidly than the printing and feed cylinder(s) of the adjacent printing unit located downstream, while at the same time maintaining each printing and feed cylinder and an associated counter-pressure cylinder in a configuration of pinching the web between them;
- each printing unit may include two printing groups each comprising a printing and feed cylinder, the printing and feed cylinder of each printing group forming a counter-pressure cylinder for the printing and feed cylinder of the other printing group in order to pinch the web against the printing and feed cylinder of said other printing group;
- each printing and feed cylinder may be a blanket cylinder of a printing group also having a plate cylinder.
- The invention also provides a rotary press of the type comprising a plurality of printing units each having at least one printing group comprising a cylinder for printing and feeding a web to be printed, and a counter-pressure cylinder for pinching a web to be printed between the counter-pressure cylinder and the printing and feed cylinder, the press also comprising at least one cylinder for feeding said web located downstream of the printing units in the direction of movement of the web, wherein the press comprises means for driving the printing and feed cylinders and the downstream feed cylinders, and control means adapted and programmed for the implementation of a control process such as defined above.
- The invention and its advantages will be better understood on reading the following description which is given purely by way of example and with reference to the appended drawings in which:
-
FIG. 1 is a general diagrammatic view of a rotary press; -
FIGS. 2 and 3 are diagrammatic views of a printing unit of the press ofFIG. 1 , in two distinct configurations; and -
FIGS. 4 to 6 are graphs illustrating different processes for controlling the press ofFIG. 1 , these processes being in accordance with the invention. -
FIG. 1 illustrates arotary press 2 which is to print aweb 4 of material, for example, a web of paper. - During printing operations, the
web 4 moves through thepress 2, under tension and at high speed, following a path of movement from left to right inFIG. 1 , as illustrated by the arrow S. - In the following description, the terms “upstream” and “downstream” are to be understood in relation to the direction of movement of the
web 4 in thepress 2 following its path of movement. - The
press 2 comprises a plurality of functional units, including, in succession from upstream to downstream, an unreeling unit 6, printing units U1, U2, U3 and U4, adrying unit 8, acooling unit 10 and a folding and/or receivingunit 12. -
Units - The unreeling unit 6 enables the
web 4 to be unwound from a roll. Each printing unit U1, U2, U3, U4 enables theweb 4 to be printed recto-verso. Thedrying unit 8 enables theweb 4 to be dried after it has been printed. Thecooling unit 10 enables theweb 4 to be cooled after it has been dried. Thefolding unit 12 enables theweb 4 to be folded, for example, to form pamphlets. - As shown in
FIGS. 2 and 3 , each printing unit U1, U2, U3 and U4 is a twin unit and comprises twoprinting groups web 4 for recto-verso printing thereof. - Each of the
printing groups blanket printing cylinder 18, aplate cylinder 20 and an inkingcylinder 22, which have parallel axes. - Each printing unit U1, U2, U3, U4 comprises a mechanism for supporting and displacing the
cylinders printing groups FIG. 2 ) and a throw-off configuration (FIG. 3 ). - In throw-on configuration (
FIG. 2 ), thecylinders 18 of theprinting groups web 4 between them. Thecylinder 20 of each of thegroups cylinder 18 of that group, and thecylinder 22 of each of thegroups cylinder 20 of that group. - During printing operations, the
groups cylinder 22 deposits ink on one or more plate(s) carried by thecylinder 20 and imposed in accordance with the design to be printed, and the or each plate deposits the ink in accordance with the predetermined design on a blanket carried by thecylinder 18, which deposits the ink on one face of theweb 4. - In throw-off configuration (
FIG. 3 ), thecylinders 18 are spaced apart from each other by a spacing e sufficient to allow theweb 4 to pass through, that is to say, a spacing e greater than the thickness of theweb 4. - The throw-off configuration permits intervention in the printing unit U1, U2, U3, U4 for maintenance operations, for example, in order to change the plates, the blankets or the cylinders.
- As shown in
FIG. 3 , in throw-off configuration, in each of thegroups cylinder 20 is spaced from thecylinder 18, and thecylinder 22 is spaced from thecylinder 20. - In a variant, in throw-off configuration, the
cylinders 18 of thegroups cylinders same group - Returning to
FIG. 1 , the unreeling unit 6 hascylinders 24 for diverting theweb 4, which are free in rotation. - The
drying unit 8 comprises means for heating theweb 4 in order to dry the ink deposited on theweb 4. - The
cooling unit 10 comprisescylinders 26 for diverting theweb 4. - The
folding unit 12 comprises, in the example shown acone 28 for folding theweb 4, for example, in accordance with a longitudinal folding line. Thefolding unit 12 comprises several pairs ofcylinders 30 which are located upstream and downstream of thefolding cone 28. The twocylinders 30 of each pair pinch theweb 4 between them. - The units U1, U2, U3, U4, 10 and 12 have
devices 32 for driving theircylinders own device 32. - Each
device 32 comprises one or more motors. For example, thedevice 32 of each of the printing units U1, U2, U3 and U4 comprises a motor common to the twoprinting groups printing group cylinders - The
press 2 has a detectingdevice 34 associated with each of the units U1, U2, U3, U4, 10, 12, and acentral control system 36 for all of those units. - Each detecting
device 34 is suitable for emitting a measurement signal representing the angular position or the angular velocity of thecylinders - The
control system 36 is connected to the detectingdevices 34 in order to receive the measurement signals emitted therefrom and is connected to thedrive devices 32 in order to send them control signals after processing the measurement signals. - During printing operations, the
cylinders web 4 and are each driven in rotation by thedevice 32 of their unit U1, U2, U3, U4, 10, 12. Thosecylinders web 4 through thepress 2. - The rotation of the
cylinders web 4 under tension between the various units of thepress 2 and, on the other hand, to ensure correct printing of theweb 4, without any shift between the images printed by the various printing units U1, U2, U3, U4. - To that end, the
control system 36 controls thecylinders - It sometimes happens that the
web 4 breaks during printing operations owing to the mechanical and thermal stresses to which it is subjected and often as a result of a defect in theweb 4. - The
press 2 hasdetectors 38 for web breakage which are located along the path of theweb 4. Thepress 2 comprises, for example, onedetector 38 between each pair of adjacent units. - The
detectors 38 are detectors of a known type and, for example, optical detectors suitable for detecting a break in theweb 4 by the modification of a light beam reflected by theweb 4 or passing through theweb 4 owing to the loss of tension in theweb 4. - In the event of the
web 4 breaking downstream of a printing unit, theweb 4 tends to adhere to thecylinders 18 of that printing unit owing to the ink covering thosecylinders 18. Thus, theweb 4 tends to become wound around one of them. - There is a risk that the accumulation of the
web 4 wound around acylinder 18, between thatcylinder 18 and thecylinder 20 of the same printing group or between thatcylinder 18 and thecylinder 18 of the other printing group of the printing unit, will damage those cylinders, the plates or the blankets carried by those cylinders, or the printing unit as a whole, or will prevent the operation of thepress 2 for a variable period owing to the pollution of thepress 2 by pieces of theweb 4. - The replacement of a cylinder, its plate or its blanket and the restarting of the printing unit are laborious and expensive.
- In order to protect the printing units U1, U2, U3 and U4 in the event of the
web 4 breaking, an emergency shutdown of thepress 2 is implemented in the course of which the feed cylinders of thepress 2 are braked, for example, by applying to them a resistant braking moment by means of the motors of thedrive devices 32. -
FIG. 4 is a graph showing the rate of movement (y-axis) of the feed cylinders of thepress 2, as a function of time (x-axis). - The rate of movement of a feed cylinder is the rate of movement applied by that feed cylinder to the
web 4, which is substantially equal to the product of the angular velocity of that cylinder and its radius. - In
FIG. 4 , in a normal operating phase, between the instants T0 and T1, the feed cylinders are driven in a synchronized manner at the same constant rate of movement V0. - On detecting a breakage of the
web 4 at instant T1, a step of emergency shutdown of thepress 2 is implemented by braking the feed cylinders of thepress 2 by applying a braking moment by means of the motors of thedevices 32. - As of the commencement of the emergency shutdown, the
printing groups cylinders 18 from theweb 4. - In addition, in accordance with the process of the invention, a step of differential braking of the feed cylinders of the
press 2 is implemented. - In particular, in the differential braking step, the cylinders of the printing units U1, U2, U3 and U4, and in particular their
cylinders 18, are braked more rapidly than thefeed cylinders units - Thus, as shown in
FIG. 4 , thecylinders 18 of the printing units U1, U2, U3 and U4 are stopped at instant T2, before thefeed cylinders units - For example, the feed cylinders of the printing units U1, U2, U3 and U4 are stopped in three seconds, while the
feed cylinders units - The faster braking of the
cylinders 18 enables a winding thickness of theweb 4 around thosecylinders 18 to be limited, and consequently limits the risks of damage to thosecylinders 18 and to the printing units U1, U2, U3 and U4. - The drive motors of the
cylinders 18 are generally of a larger capacity than the motors of the other feed cylinders of thepress 2 owing to the larger resistant moments encountered by thecylinders 18. The faster braking of thecylinders 18 is therefore possible without making any structural modification to thepress 2 and merely by modifying the programming of the emergency shutdown of thecontrol system 36. - In the embodiment of
FIG. 4 , thecylinders 18 of the printing units U1, U2, U3 and U4 are slowed down in a manner synchronized with each other and stop at the same instant T2. The feed cylinders of theunits - In a variant illustrated in
FIG. 5 , on detecting a breakage of the web at instant T1, a preliminary step of synchronized braking is implemented in which thecylinders 18 of the printing units U1, U2, U3 and U4 and thecylinders units printing groups - Once the throw-off configuration has been reached, at an instant T4, the differential braking step is implemented as before, by braking the
cylinders 18 more rapidly than thecylinders - The
cylinders 18 stop at an instant T5 before thecylinders - The preliminary step of synchronized braking prevents fresh breaks in the
web 4 caused by the different decelerations of theweb 4 which increase the tension in theweb 4. - Advantageously, in order to accelerate the stopping of the printing units U1, U2, U3, U4, the differential braking step is commenced as soon as the spacing between the
cylinders 18 of each printing unit U1, U2, U3, U4 is greater than the thickness of theweb 4, without waiting to reach the throw-off configuration. - In another embodiment illustrated in
FIG. 6 , on detecting breakage at instant T1, theprinting groups cylinders 18 of the printing units U1, U2, U3 and U4 are slowed down in a differential manner. - In a first variant illustrated in
FIG. 6 , thecylinders 18 of each of the units U1, U2 and U3 are braked more rapidly than those of the adjacent printing unit U2, U3 and U4, respectively, located downstream. - Thus, the deceleration rate of the printing units U1, U2, U3 and U4 decreases from upstream to downstream. The result is that the tension of the
web 4 is increased between each pair of adjacent printing units between which theweb 4 is still under tension, which is the case if the point of breakage of theweb 4 is not located between the two printing units of said pair. - A sufficient increase in tension enables the
web 4 to be broken again between the two adjacent printing units, which limits the length ofweb 4 capable of becoming wound around thecylinders 18 of those printing units. - Thus, for example, if the
web 4 breaks initially between the dryingunit 8 and thecooling unit 10, theweb 4 will be broken owing to the differential braking at three points of secondary breakage, between the units U1 and U2, the units U2 and U3, and the units U3 and U4. - In a second variant, the cylinders of the printing units U1, U2, U3 and U4 located upstream of the point of breakage are braked more rapidly than the cylinders of the printing units U1, U2, U3 and U4 located downstream of the point of breakage.
- The risk of becoming wound around downstream of the point of breakage is less great because the downstream portion of the
web 4 continues to be fed in the downstream direction by the units of thepress 2 located downstream of the point of breakage. Consequently, the differential braking purely of the printing units located upstream of the point of breakage greatly limits the risk of becoming wound around. - In this second variant, the cylinders of the printing units U1, U2, U3 and U4 located upstream of the point of breakage are slowed down in a manner synchronized with each other, or in a manner which is differential with respect to each other, in accordance with the first variant.
- The cylinders of the printing units U1, U2, U3 and U4 located downstream of the point of breakage are slowed down at the same rate or more rapidly than the cylinders of the units of the
press 2 located downstream of the printing units U1, U2, U3 and U4. - In addition, the risks of becoming wound around are greater when the breakage of the web occurs in a zone A (
FIG. 1 ) of thepress 2 between the printing unit U1 the furthest upstream and thecooling unit 12, than when the breakage of the web occurs in a zone B downstream of the zone A. - Consequently, during an emergency shutdown, a differential braking step according to the invention may be implemented when a breakage of the
web 4 is detected in the zone A and the differential braking step is not implemented when a breakage of the web is detected in the zone B. - If in the course of the emergency shutdown of the
press 2 without differential braking, a fresh breakage of theweb 4 is detected in the zone A, a differential braking step according to the invention may be implemented. - A differential braking step may be implemented in accordance with any one of the embodiments and any one of the variants explained above.
Claims (13)
1 to 12. (canceled)
13. A method for controlling a rotary press for printing a web of material, the press including:
printing units each having at least one printing and feed cylinder for printing and feeding the web in a direction of movement; and
at least one downstream feed cylinder for feeding the web located downstream of the printing units in the direction of movement of the web; the method comprising the steps of:
driving, in normal operation, the printing and feed cylinders and the at least one downstream feed cylinder in a synchronized manner; and,
performing, in the event of the web breaking, differential braking of the printing and feed cylinders and of the at least one downstream feed cylinder.
14. The method as recited in 13 wherein the printing and feed cylinders and the at least one downstream feed cylinder are braked in a synchronized manner during the differential braking step.
15. The method as recited in claim 14 wherein, during the synchronized braking, within each printing unit, each printing and feed cylinder is moved away from an associated counter-pressure cylinder provided to pinch the web against the printing and feed cylinder, and the differential braking step is started when each printing and feed cylinder is moved away from the associated counter-pressure cylinder by a predetermined minimum spacing.
16. The method as recited in claim 13 wherein, during the differential braking step, at least one of the printing and feed cylinders is braked more rapidly than the at least one downstream feed cylinder.
17. The method as recited in claim 13 wherein, during the differential braking step, at least two of the printing and feed cylinders are braked in a synchronized manner.
18. The method as recited in claim 13 wherein, during the differential braking step, one of the printing and feed cylinders is braked in a differential manner with respect to another one of the printing and feed cylinder.
19. The method as recited in claim 18 , wherein, during the differential braking step, the printing and feed cylinders located upstream of a breakage point of the web are braked more rapidly than the printing and feed cylinders located downstream of the breakage point.
20. The method as recited in claim 19 wherein, during differential braking, the printing and feed cylinders located upstream of the breakage point are braked in a synchronized manner.
21. The method as recited in claim 13 wherein, during the differential braking step, the printing and feed cylinder of each printing unit is braked more rapidly than the printing and feed cylinder of the adjacent printing unit located downstream, while at the same time maintaining each printing and feed cylinder and an associated counter-pressure cylinder in a configuration of pinching the web between them.
22. The method as recited in claim 13 wherein each printing unit has two printing groups each comprising a printing and feed cylinder, the printing and feed cylinder of each printing group forming a counter-pressure cylinder for the printing and feed cylinder of the other printing group in order to pinch the web against the printing and feed cylinder of said other printing group.
23. The method as recited in claim 13 wherein each printing and feed cylinder is a blanket cylinder of a printing group, the printing group also having a plate cylinder.
24. A rotary press comprising:
a plurality of printing units each having at least one printing group, each printing group comprising a cylinder for printing and feeding a web to be printed, and a counter-pressure cylinder for pinching a web to be printed between the counter-pressure cylinder and the printing and feed cylinder;
at least one downstream feed cylinder for feeding the web located downstream of the printing units in the direction of movement of the web;
a motor for driving the printing and feed cylinders and the downstream feed cylinders; and
a controller driving, in normal operation, the printing and feed cylinders and the at least one downstream feed cylinder in a synchronized manner, and, performing, in the event of the web breaking, differential braking of the printing and feed cylinders and of the at least one downstream feed cylinder.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0611320A FR2910374B1 (en) | 2006-12-22 | 2006-12-22 | METHOD FOR CONTROLLING A ROTARY PRESS AND ROTATING PRESS |
FR0611320 | 2006-12-22 |
Publications (1)
Publication Number | Publication Date |
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US20080148980A1 true US20080148980A1 (en) | 2008-06-26 |
Family
ID=38292063
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/005,004 Abandoned US20080148980A1 (en) | 2006-12-22 | 2007-12-21 | Method for controlling a rotary press and rotary press |
Country Status (4)
Country | Link |
---|---|
US (1) | US20080148980A1 (en) |
EP (1) | EP1935643B1 (en) |
DE (1) | DE602007005336D1 (en) |
FR (1) | FR2910374B1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090020641A1 (en) * | 2006-01-31 | 2009-01-22 | Windmoller & Holscher Kg | Device and Method for Measuring and Setting the Web Tension Between Inking Stations of a Multicolor Press |
US20090090258A1 (en) * | 2007-09-19 | 2009-04-09 | Komori Corporation | Cylinder throw-on/off apparatus and cylinder throw-on/off method for printing press |
US20100018418A1 (en) * | 2008-07-22 | 2010-01-28 | Manroland Ag | Printing Unit In A Roll-Fed Printing Press |
US20120055358A1 (en) * | 2010-07-27 | 2012-03-08 | Goss International Americas, Inc. | Observation-Enhanced Virtual Master System for a Printing Press |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008029966A1 (en) * | 2008-06-26 | 2009-12-31 | Manroland Ag | Web Press |
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US4951567A (en) * | 1986-05-02 | 1990-08-28 | Heidelberger Druckmaschinen Ag | Electronic safety system for a printing machine |
US6298782B1 (en) * | 1993-03-25 | 2001-10-09 | Baldwin Web Controls | Anti-wrap device for a web press |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
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US5678484A (en) * | 1993-03-25 | 1997-10-21 | Baldwin Web Controls | Anti-wrap device for a web press |
DE19600110A1 (en) * | 1995-08-10 | 1997-07-10 | Baumueller Nuernberg Gmbh | Cylinders and rollers electrical drive system for sheet paper printing machine |
DE29808933U1 (en) * | 1998-05-19 | 1998-09-17 | Zirkon Druckmaschinen GmbH Leipzig, 04328 Leipzig | Device for preventing technical damage to printing machines |
DE10027442B4 (en) * | 2000-06-02 | 2005-12-01 | Man Roland Druckmaschinen Ag | Method and device for detecting web breaks |
JP2002361838A (en) * | 2001-06-13 | 2002-12-18 | Tokyo Kikai Seisakusho Ltd | Controller of power interrupting time controllable rotary press |
-
2006
- 2006-12-22 FR FR0611320A patent/FR2910374B1/en not_active Expired - Fee Related
-
2007
- 2007-12-14 DE DE602007005336T patent/DE602007005336D1/en active Active
- 2007-12-14 EP EP07291530A patent/EP1935643B1/en not_active Not-in-force
- 2007-12-21 US US12/005,004 patent/US20080148980A1/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4951567A (en) * | 1986-05-02 | 1990-08-28 | Heidelberger Druckmaschinen Ag | Electronic safety system for a printing machine |
US6298782B1 (en) * | 1993-03-25 | 2001-10-09 | Baldwin Web Controls | Anti-wrap device for a web press |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090020641A1 (en) * | 2006-01-31 | 2009-01-22 | Windmoller & Holscher Kg | Device and Method for Measuring and Setting the Web Tension Between Inking Stations of a Multicolor Press |
US8485095B2 (en) * | 2006-01-31 | 2013-07-16 | Windmoeller & Hoelscher Kg | Device and method for measuring and setting the web tension between inking stations of a multicolor press |
US20090090258A1 (en) * | 2007-09-19 | 2009-04-09 | Komori Corporation | Cylinder throw-on/off apparatus and cylinder throw-on/off method for printing press |
US8720332B2 (en) * | 2007-09-19 | 2014-05-13 | Komori Corporation | Cylinder throw-on/off apparatus and cylinder throw-on/off method for printing press |
US20100018418A1 (en) * | 2008-07-22 | 2010-01-28 | Manroland Ag | Printing Unit In A Roll-Fed Printing Press |
US20120055358A1 (en) * | 2010-07-27 | 2012-03-08 | Goss International Americas, Inc. | Observation-Enhanced Virtual Master System for a Printing Press |
US10279584B2 (en) * | 2010-07-27 | 2019-05-07 | Goss International Americas, Inc. | Observation-enhanced virtual master system for a printing press |
Also Published As
Publication number | Publication date |
---|---|
FR2910374A1 (en) | 2008-06-27 |
EP1935643A1 (en) | 2008-06-25 |
EP1935643B1 (en) | 2010-03-17 |
FR2910374B1 (en) | 2009-04-03 |
DE602007005336D1 (en) | 2010-04-29 |
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